CFD Online Discussion Forums - Does DPMFoam consider particles as volumic or just a point?

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Collision parameters in kinematicCloudProperties file of DPMFoam solver

Hello, I am working with the lagrangian particle tracking solver, DPMFoam, in openfoam 2.3.0
Does any one know any what does each of the following parameters (in kinematicCloudProperties file) exactly mean:

Code:

        pairSpringSliderDashpotCoeffs

        {

            alpha               0.02;

            b                     1.5;

            cohesionEnergyDensity 0;

        };

and:

Code:

       wallSpringSliderDashpotCoeffs

        {

            distance            0.002;

        };

and how can i define a rigid particle (no elasticity)?
and what is a reference for defining and explaining the theory of Spring-Slider-Dashpot collision which has been used in openFoam/kinematicCloud class?